Conventional wisdom and the most recent polling (which, frankly, is outdated) suggest that McCain is Romney’s biggest threat in New Hampshire, the next step in choosing a Republican nominee.

Both have put out attack ads (with thanks to Political Buzz, which found links to both and posted them together online):

Seems that we Republicans aren’t immune to the sort of negativity that’s been plaguing the Democratic race all along (anyone else left wondering if either Romney or McCain dreamed of creating attack ads for the presidency in Kindergarten?)

Interesting that Romney is using McCain’s old attack ads to challenge him. Funny how he’s the one going that route, considering that he’s been the most negative in the 2008 race on the Republican side thus far.