INDIANAPOLIS (September 24, 2012)--Democrats are splitting roughly $1.2 million in new spending between tight races in Indiana and Nevada as they try to maintain control of the Senate.

Senate Democrats plan to spend $630,000 on a one-week advertising run in Nevada and $525,000 in Indiana over the same time period.

The Democratic Senatorial Campaign Committee's new spending begins Tuesday and will air on broadcast and cable.

A Democrat tracking ad buys confirmed the numbers on condition of anonymity because the ads have not started running.

Senate Democrats have watched their chances of maintaining their slim edge in the Senate improve slightly in the last few weeks, but outside groups on both sides of the aisle are greatly increasing spending in key races as the battle for the Senate enters its final weeks.