U.S. Senator Susan Collins (R) continues to lose support in her bid for reelection, according to the latest Rasmussen Reports telephone survey. In April, Collins led her Democratic challenger Tom Allen by 16 percentage points, but is now down to only a seven point lead at 42%, dropping her below 50% for the first time.

Collins' favorability rating -- at 65 percent -- is still high but is down five percentage points from last month. Meanwhile, her unfavorables rose from 29% to 33% in the past month.

She also has lost support from voters in her own party, with supports falling from 89% to 81% in just one month.

As for the democrats, Collins' challenger U.S. Rep. Tom Allen (D) has sustained fairly constant support over weeks of campaigning. Viewed favorably by 56% of voters and unfavorably by 37%, his numbers are essentially unchanged since May. Among his party, Allen's support has increased to 72% this month, up eight percentage points from May.

Allen earns support from 12% of the state's Republican voters, up from 9% last month, while 24% of Democrats still support Collins.

Is there still hope? Perhaps. In terms of unaffiliated voters, Collins leads 52% to 34%, a major step up from last month when Collins and Allen were tied at 4