Two polls show Romney up by four points. The PPP poll for the Daily Kos is the most surprising, showing Romney with 50% and Obama with 46%. That smooths out a really big Sunday lead for Romney over three days. The caveat here is that Kos reports the internals as 44% conservative and 16% liberal. Conservatives outnumber liberals by about 2 to 1 in the US, but not three to one.
However, Gallup shows the same 50/46% advantage for Romney in its seven day average of likely voters.