Outside expenditures for the U.S. Senate battle between appointed Democratic Sen. Michael Bennet and Republican Ken Buck should easily top $40 million, and could approach nearly $50 million by the time the dust settles on the 2010 election:
A whopping $31 million has gone into the contest between Democratic incumbent Michael Bennet and Republican challenger Ken Buck.
Even competitive Senate races in states such as Pennsylvania and Nevada have seen only half as much cash.
The bulk of that money – nearly $22 million – went to television and radio attack ads. Other money went to phone calls to voters, direct mailings and get-out-the-vote measures.
And that was just for independent expenditures through the end of October.
The Washington Post has tracked independent expenditures and has these figures:
Interest groups and political parties have reported spending $33,435,827 on independent campaigning in the Colorado Senate race this year, with $17,953,163 benefiting Republicans and $15,311,279 benefiting Democrat.
The Sunlight Foundation had a similar figure–$32,779,082.89.
None of these figures accounts for the candidates’ own campaign expenditures.