As we head into the election homestretch, it seems a good time to ask: What is the top watched online ad of the 2012 election cycle so far?

There are lots of contenders: American Future Fund’s ad attacking President Barack Obama’s ties to Wall Street – and a similar ad from the group – were heavily watched, as was the infamous Herman Cain “smoking man” ad. A pro-Ron Paul ad from super PAC Endorse Liberty also drew heavy traffic, as did a Paul campaign ad attacking Republican primary rival Newt Gingrich. Mr. Obama’s campaign scored with a long online documentary narrated by Tom Hanks, “The Road We’ve Traveled,” and with another video announcing the launch of “African Americans for Obama.” A recent attack ad from the Obama campaign featuring Mitt Romney singing “America the Beautiful” also drew lots of viewers.

But none of these took the crown.