Two outside groups -- Majority PAC and the Democratic Senatorial Campaign Committee -- have just dropped a combined $1.6 million on the Missouri Senate race, according to FEC reports filed Thursday.

Majority PAC said it has spent $996,059 to oppose Rep. Todd Akin, while the DSCC filed a $625,072 spending report.

The money -- on top of Sen. Claire McCaskill's outsized fundraising advantage in her own campaign committee -- suggests Missouri voters will see far, far more ads for the Democrat (or against the Republican) in the closing weeks, than for her opponent.

One examination of local TV ad filings shows McCaskill alone is out-buying Akin 10-to-1 in October. Today's $1.6 million will be on top of that.

This week Akin reported raising $1.6 million in the third quarter. In one day, outside groups opposing his candidacy dropped an equal amount into the state.

So far, the outside groups who could help Akin -- the U.S. Chamber, Crossroads, the NRSC -- have kept with their promise to send their cash to other states.

American Bridge, the group that is sending mailers with Akin's rape comment embedded in audio, says it spent about $37,000 for the mailer.

Akin is getting some help. The National Rifle Association committee has spent about $120,000 on a mailer opposing McCaskill.

The spending isn't all good news for McCaskill. It suggests outside groups still think the race is close.