The Democratic House Majority PAC will launch three new ads today, giving a final boost to two Democratic Congressmen and a candidate running in an open seat.

The first spot is in Illinois’ open 12th district, represented by retiring Democratic Rep. Jerry Costello. It highlights the contrast between the Republican nominee, businessman Jason Plummer, and the Democratic nominee, retired Maj. Gen. William Enyart. The ad, backed by $125,000 from today through Nov. 6 on broadcast television in the Paducah, Ky., media market, paints Plummer as someone who “praises” a plan that would “end Medicare.”

The second spot is in Massachusetts’ 6th district, where eight-term Democratic Rep. John Tierney faces an uphill battle against former state Sen. Richard Tisei (R). The ad attempts to tie Tisei to the tea party as well as the Medicare changes  in the budget of Rep. Paul Ryan (R-Wis.). The spot is backed by about $320,000 on broadcast television in the Boston media market over a week beginning today.

The third spot is in New York’s 1st district, where Rep. Tim Bishop (D) faces a rematch with businessman Randy Altschuler (R). The ad hammers on Altschuler’s outsourcing business. The spot begins today and is backed by $500,000 on targeted cable in the expensive New York City media market.