The presidential election is effectively tied in the swing states of Colorado, Iowa and Nevada according to the latest Marist/NBC News polls. President Obama is technically up by two in Nevada and one in Colorado but those small leads are within the margin of error.

Colorado
Marist (5/22-24)
Barack Obama 46%
Mitt Romney 45%
Other 1%
Undecided 8%

Iowa
Marist (5/22-24)
Barack Obama 44%
Mitt Romney 44%
Other 2%
Undecided 10%

Nevada
Marist (5/22-24)
Barack Obama 48%
Mitt Romney 46%
Other 1%
Undecided 5%

Part of the reason the race remains so tight in these three states is the economy continues to dominate the election, and on that issue voters are split on who would be better able to handle it. In Nevada the divide is even, with 44 percent thinking Obama would do a better job with the economy and 44 percent thinking Mitt Romney would do better. In Colorado Romney has a slight edge on the economy, 45% to 42%; and in Iowa Romney’s lead on the economy is even larger, 46% to 41%. Not Surprisingly, Romney does best in the head-to-head matchup in the states where he has the edge on the economy.

The Obama team essentially has two options to try to win the economy issue. They can try to convince voters Obama actually did a really good job with the economy. Of course that would be extremely difficult to do when official unemployment is over 8 percent, unless the economy really picks up in the coming months. Their other option is to try to tear down Romney on this issue, and that is tactic the Obama campaign is taking. It has been mainly focused on Romney’s years at Bain Capital and his rather pathetic jobs record as governor of Massachusetts.

One part of the polls that should be concerning to Democrats is that in Iowa and Colorado more of Romney’s supporters are enthusiastic to vote.