Amid an extraordinarily media-driven presidential campaign, the Internet has loomed large, influencing everything from fundraising to fact-checking.
Nielsen Online recently analyzed the online presidential campaign, examining online advertising by the candidates, Web traffic and online video viewing at both campaign’s sites, and blog buzz related to the election.

Online Advertising
Senator Barack Obama’s campaign ramped up its online advertising in mid-September. Image-based ad impressions by the Obama campaign grew 202% from September 15 to 22 — and by another 94% by September 29.
In mid-October, Obama’s campaign also stepped up its sponsored link advertising, …

The final presidential debate between Senators John McCain and Barack Obama drew 56.5 million U.S. viewers Wednesday night, Nielsen reported Thursday.
The TV audience for the senators’ third meeting edged past that of their first debate at the end of September, which drew 52.4 million viewers, but was easily surpassed by the audience of 63.2 million that tuned in for the second presidential debate last week.
During the previous presidential campaign, 51.2 million viewers tuned in for President Bush and John Kerry’s third debate on Oct. 13, 2004.  (View complete historical debate ratings.)
As …

The combined overall household rating for Wednesday night’s final presidential debate, in the top 56 local television markets where Nielsen maintains electronic TV meters, was 38.3. 
In comparison, last week’s debate between Senators McCain and Obama — the candidates’ second – received a 42.0 household rating in the top 55 local TV markets.  The candidates’ first debate on September 26 received a 34.7 household rating in the top 55 markets.
Wednesday night’s championship baseball game between the Los Angeles Dodgers and the Philadelphia Phillies — aired by FOX, instead of the debate – may have impacted the …

On Tuesday night, 63.2 million U.S. viewers watched the second presidential debate between Senators John McCain and Barack Obama.
The TV audience for the senators’ second meeting easily surpassed that of their first debate, which drew an audience of 52.4 million on Friday, Sept. 26.
During the previous presidential campaign, 46.7 million viewers tuned in for President Bush and John Kerry’s second debate on Oct. 8, 2004. 
See more historical debate ratings.

CBS’s “NCIS” was the number one-ranked primetime telecast on broadcast TV for Tuesday, October 7, 2008, drawing an audience of almost 16.3 million average viewers.
ABC’s special presentation of “Dancing With The Stars” claimed second place, with almost 15.1 million viewers.  ABC’s post-debate analysis of the second McCain/Obama presidential debate rounded out the top three, with just over 9.9 million viewers.
Post-debate coverage on NBC, CBS, and FOX also made the top ten.

RANK
NAME
NETWORK
VIEWERS (P2+)

1
NCIS
CBS
16,288,000

2
DANCING W/STARS RESULT SP(S)-10/07/2008
ABC
15,065,000

3
VOTE2008:ANALYSIS-TUE(S)-10/07/2008
ABC
9,917,000

4
DECISION ‘08:PRES ANALYS2(S)-10/07/2008
NBC
8,349,000

5
CAMPAIGN ‘08-DEBATE ANL-2(S)-10/07/2008
CBS
7,951,000

6
BIGGEST LOSER 6
NBC
7,265,000

7
HOUSE
FOX
6,365,000

8
FUEGO EN LA SANGRE TUE
UNI
5,634,000

9
CUIDADO CON EL ANGEL TUE
UNI
4,637,000

10
FOX NEWS: …

The combined overall household rating for Tuesday night’s second presidential debate, in 55 of the 56 local television markets where Nielsen maintains electronic TV meters, was 42.1.
In comparison, the first debate between Senators McCain and Obama received a much lower household rating (34.7) in the top 55 local TV markets.  Last week’s V.P. debate received a 45.0 household rating in the top 55 markets.
One rating point equals 1% of the total TV audience in a given market.
The Nashville market, where the debate was held, had the largest TV audience, with a household rating of 59.2, while the Sacramento/Stockton/Modesto, California market had …

If book sales were electoral votes, the U.S. presidential election would hardly be a close contest.
So far in 2008, four books published by Sen. Barack Obama between 2004 and fall 2008 have sold a combined 912,000 copies, according to Nielsen BookScan. 
In comparison, Sen. John McCain’s five titles, published between 1999 and summer 2008, have sold a total of 116,000 copies — almost 800,000 copies less than Obama.
Between January and September 21, 2008, McCain’s top selling book, “Faith of My Fathers,” sold 73,000 copies in hardcover, paperback, and audio editions. 
Obama’s top …

On Tuesday night, 69.9 million viewers tuned in to watch the sole vice presidential debate between Joe Biden and Sarah Palin.
The Biden-Palin matchup set a new V.P. debate TV audience record, beating the previous high of 56.7 million viewers set by the debate between Rep. Geraldine Ferraro and then-V.P. George H.W. Bush in 1984*. 
Biden and Palin’s debate also surpassed the first presidential debate between Barack Obama and John McCain, which drew an audience of 52.4 million last Friday night.
During the last presidential election in 2004, the vice presidential debate between V.P. Dick Cheney and Sen. …

The combined overall household rating for Thursday night’s vice presidential debate, in 55 of the 56 local television markets where Nielsen maintains electronic TV meters, was 45.0.
One rating point equals 1% of the total TV audience in a given market.
The Baltimore market had the largest TV audience, with a household rating of 59.1, while the Los Angeles market had the lowest household rating: 34.4.

According to data from across 11 networks, the first presidential debate on September 26 between John McCain and Barack Obama drew 52.4 million viewers.
The TV audience for the first presidential debate of the 2008 election was roughly 16% smaller than the audience for the first debate between President Bush and John Kerry during the 2004 election, which drew 62.5 million viewers on September 30, 2004. See more historical debate ratings.
ABC, CBS, FOX, NBC, Telefutura, Telemundo, BBC-America, CNBC, CNN, FOX  News Channel, and MSNBC aired live coverage of the McCain/Obama debate …