I'm not linking to the crappy ad - it doesn't deserve the views.
http://firstread.msnbc.msn.com/archive/2008/08/08/1255356.aspxBut the ad makes some dubious claims:
1) When it says that Obama voted "to raise taxes on people making just $42,000," that was on a non-binding budget resolution vote that didn't actually raise or lower taxes. From Factcheck.org: "The resolution does not contain a specific provision to raise tax rates, but rather assumes that most of the 2001 and 2003 tax cuts expire as scheduled in 2011."
2) According to Obama's economic plan, he would raise taxes only on those making more than $250,000 per year, and would provide tax cuts to those making less than that. Factcheck.org: "Obama has stated repeatedly that his plan would increase taxes only for those making more than $250,000 per year."