Three well-known anti-gay organizations -- the National Organization for Marriage, Family Research Council Action and CitizenLink -- have pledged to oppose three Republican candidates in the upcoming elections because of their pro-LGBT views.

The leaders of the three organizations wrote a letter warning House Speaker John Boehner, Senate Minority Leader Mitch McConnell, National Republican Congressional Campaign Committee Chairman Greg Walden and National Republican Senatorial Committee Chairman Jerry Moran, according to Buzzfeed.

In the letter, the groups showed concern over Republican House candidates Carl DeMaio in California and Richard Tisei in Massachusetts, as well as Republican Senate candidate Monica Wehby in Oregon. These Republican candidates are pro-gay rights and pro-abortion, which the abovementioned organizations see as an affront to conservative values.

"We believe that Republican candidates should embrace the full spectrum of conservative principles -- economic, national security and social issues -- that have defined our party since President Reagan led us to a transformative victory," the letter read, adding that a party must stand by its core principles espoused in its platform, which in turn must be defended by the party's candidates.

"Carl DeMaio, Richard Tisei and Monica Wehby are antithetical to the Republican platform."

Though it is not mentioned in the letter, DeMaio and Tisei are the only openly gay Republicans running for office, new in the party's history. According to the Washington Blade, DeMaio has come out in favor of ENDA as well as marriage equality. However, his Democratic opponent, incumbent Scott Peters, has been arguing that DeMaio abandoned the LGBT community when it needed during the Proposition 8 campaign.

Similarly, Richard Tisei is facing a tough campaign against newcomer Democrat Seth Moulton, according to the Daily Beast. Moulton defeated Democratic incumbent Rep. John Tierney, forcing Tisei's campaign strategy back to square one.

However, he is not the only Republican facing a tough campaign. Despite having come out in favor of same sex marriage earlier this month, candidate Monica Wehby is trailing behind incumbent Sen. Jeff Merkley, according to the Huffington Post.

Yet, conservative organizations have announced they will do what they can to prevent Republicans from voting for Republican candidates merely because they profess moderate social beliefs.

Anti-LGBT groups have resorted to attacking their own party because it has began to change, albeit slowly. Whether they will succeed in holding their party back, it is too soon to tell.

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