The Democratic Senatorial Campaign Committee dropped almost $1.5 million in spending for four Senate races in the final days of the campaign.

The independent expenditures filed with the FEC today covered weekend ad buys in four competitive races.

The spending included $425,000 against Republican Ken Buck in Colorado; $610,000 against former Rep. Pat Toomey (R) in Pennsylvania; $270,000 against Republican Dino Rossi in Washington state; and $163,550 against Sen. Lisa Murkowski (R-Alaska).

In the first three races, polling shows they are too close to call. And Democrats sense an opportunity in Alaska: if Murkowski's write-in bid causes her and Republican nominee Joe Miller to split the GOP vote, it could give Democrat Scott McAdams the win.