Two new expenditures by the Democratic Senatorial Campaign Committee:

• CO-SEN: $335,000 for TV airtime against Ken Buck, R.
• IL-SEN: $15,000 for online ads against Mark Kirk, R.

Note that the DSCC has now spent $2.4 million in Colorado — one of the races where their candidate (Sen. Michael Bennet) trails but is still genuinely competitive. In Pennsylvania, where the situation looks tougher for the Dems this year, they have already spent $3 million.

In Illinois, the most competitive of the three, they have spent just over half a million.