A new poll of four critical swing states by Purple Strategies, taken after Mitt Romney selected Paul Ryan as his running mate, shows Romney leading in three critical swing states — Virginia, Ohio, Florida. Romney trails Obama in the fourth — Colorado — that Purple Strategies polled.

In Virginia and Ohio, Romney has gained ground since last month. In Virginia, a state that may determine the 2012 election, Romney leads Obama by 3 points (48% to 45%). Last month, Romney trailed Obama by two points.

In Ohio, Romney leads Obama by two points (46% to 44%). Last month, Obama led by 3 points, 48% to 45%.

In Colorado, Obama leads 49% to 46%, and that is a 2-point improvement from last month.

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