Obama's lead over the frontrunner for the Republican nomination, former Massachusetts Gov. Mitt Romney, is now just six points among registered voters, 49 percent to 43 percent. That is down from a nine-point advantage for Obama in February. Romney leads among a smaller sample of national Republican primary voters. Romney is the preferred choice of 30 percent of Republicans in the poll, with former Alaska Gov. Sarah Palin in second place at 14 percent. Businessman Herman Cain is third with 12 percent, and Texas Gov. Rick Perry is fourth at 8 percent. Americans are not only taking their frustration out of the administration. The percentage of Americans who approve of how Congress is handling its job is only 18 percent, the lowest rating since March 2010. A whopping 74 percent of Americans disapprove of the legislative branch. Voters are now split on which party they would like to see control Congress after the 2012 elections: 44 percent prefer a Democratic Congress, and 44 percent prefer a GOP-controlled Congress. In the final poll before the 2010 elections, Democrats held a two-point lead on this question but lost 63 seats in the House, handing control of that chamber to Republicans. The poll was conducted June 9-13 by a bipartisan team led by Democratic pollster Peter Hart and Republican pollster Bill McInturff. The sample size for all adults is 1,000, for a margin of error of +/- 3.1 percent. There were 836 registered voters; those results carry a margin of error of +/- 3.4 percent. For the Republican presidential primary, the sample size was quite a bit smaller: 242 voters were surveyed, for a higher margin of error of +/- 6.3 percent.