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Politicians choose their party for a couple of main reasons. One is basic ideology--are they basically liberal or conservative? But they also join for other reasons, like electability, regional expectations, family and friends, etc.
Back until the 80s, Texas always voted Democrat within the state, but there was a conservative and liberal side to the Democratic Party. The real elections were held during the primaries--the general election was just a formality. This helped the side in power to cheat, since the primaries were easier to rig than the general. As a random example--Ralph Yarborough, a populist liberal, ran for governor three times in the fifties against conservative Democrats. Twice he ran against the incumbent, Allan Shivers, a conservative Democrat. Polls showed he would win the third election, so Shivers stepped down, and the conservative Democrats ran the popular conservative senator Price Daniels. Historians largely agree that Yarborough got more votes, but the Democratic Party just declared that Daniels had won, and Yarborough had no recourse.
He got his revenge, though. He ran for the senate seat Daniels had vacated, and won, and served thirteen glorious populist years in the Senate.
But to ask whether some Democrats are really Republican isn't really a good question. If they choose to run as Democrats, they are Democrats. They build the Democratic majority, which give the Democrats (conservative and liberal) control of Congress, which allows us to control what legislation is introduced. So they are helping the Democratic Party, even if they vote against it on many bills.
But certainly there are Democrats who vote with the Republicans many times. Even that is misleading, though. Many do so just because that's what their electorate requires them to do, and are personally liberal. Someone like Mary Landrieu in Louisiana, for instance, is a liberal, but she could not win if she ran as a liberal in the South. She sounds and acts like a conservative, but she chooses to be a Democrat, this giving the Democrats control of the Senate, thus letting us control the committees, and lead the Senate.
It's not so simple, is what I'm saying.
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