(CNN) - Maine Sen. Olympia Snowe called fellow colleague Sen. Arlen Specter's party defection disconcerning Wednesday, and likened moderate Republicans to participants on a reality television show known for isolating its members and picking them off one-by-one.
"Being a Republican moderate sometimes feels like being a cast member of "Survivor" - you are presented with multiple challenges, and you often get the distinct feeling that you're no longer welcome in the tribe," Snowe wrote in an op-ed for the New York Times.
The remarks follow Pennsylvania veteran Sen. Arlen Specter's unexpected defection to the Democratic Party on the eve of President Obama's 100th day in office. A member of the Republican Party since 1966, Specter announced his change of political affiliation to Democrat, citing the GOP has shifted too far to the right of his views and that his chance of winning the state Republican primary next year was bleak.
"It is truly a dangerous signal that a Republican senator of nearly three decades no longer felt able to remain in the party," Snowe says. "It didn't have to be this way."
The moderate Republican senator from Maine blamed the GOP emphasis on conservative social values over the party's core fiscal principles as the reason for Republican voter losses.
"Ideological purity is not the ticket back to the promised land of governing majorities – indeed, it was when we began to emphasize social issues to the detriment of some of our basic tenets as a party that we encountered an electoral backlash," she writes. "We should view an expansion of diversity within the party as a triumph that will broaden our appeal."
"We cannot prevail as a party without conservatives. But it is equally certain we cannot prevail in the future without moderates," Snowe warns.