WASHINGTON  Rand Paul, the    Republican senator from Kentucky, announced on his website    Tuesday morning that hes running for president. He says hes    a different kind of Republican leader, by which he means a    libertarian kind. The closer he gets to the presidency,    however, the less libertarian he gets. His evolution is a case    study in how hard it is even for a talented politician to    remake his party.  
    Paul argues that his concern for civil liberties, skepticism    about foreign intervention and willingness to back off in the    War on Drugs will win him the support of voters who have never    pulled the lever for a Republican. He has spoken often about    bringing more minorities and young people into the Republican    tent. He hopes to rebrand his party the way Bill Clinton did    when he ran, in 1992, as a different kind of Democrat. But    while Clinton had some success at remaking his party, so far    Pauls party is remaking him.  
    Paul has shifted most on national-security issues. Last summer,    he switched from skepticism to enthusiasm about bombing Islamic    State militants. In March, he signed a letter from Republican    senators warning Irans leaders that any nuclear deal they    agreed to might not outlast Barack Obamas presidency. Then he    sponsored an amendment to boost defense spending, which he had    tried to cut in his first year in office.  
    The senator gets a bit of a bad rap for shifting on social    issues. He has always opposed abortion and same-sex marriage,    but hes also been eager to make these issues a smaller part of    national politics. His desire for the nomination, though, seems    at least to be shifting his emphasis. He described the success    of the movement for same-sex marriage as a moral crisis.  
    There are two reasons Paul hasnt had much success in shifting    the Republican Party his way. The first is that on his    signature issues, there are more Republicans who actively    oppose his stances than actively support them. Most Republicans    have vague views on foreign policy that shift with the times:    Years of American bloodshed in Iraq and Afghanistan made them    more dovish, and then news of aggression from Russia and    Islamic State made them more hawkish. But among Republicans who    vote on the issue  and make noise about it  there are far    more advocates of using or threatening force abroad than there    are of retrenchment. So Paul wasnt going to be able to help    himself by campaigning on his original foreign-policy views.  
    The second is that Republicans dont believe that they need to    move in his direction on these issues to win elections. Most of    them think a relatively muscular stance on foreign policy is an    asset, not a liability. On some of Pauls other issues  drugs,    surveillance, criminal-justice reform  moving in his direction    might help the party, but only a little. In other words,    Republicans dont think their positions on these issues are in    need of much change. Democrats were in a different position    when Clinton ran as an opponent of liberal orthodoxy on    welfare: That orthodoxy had hurt Democrats badly, and a lot of    them knew it.  
    Put both factors together, and Paul is left with no sizable    constituency that wants his distinctive views and no sense    among the rest of the party that they have to embrace them if    they want to win elections. So hes walking away from what    makes him distinctive, becoming a conventional rather than    transformative Republican.  
    Republicans have sometimes talked about remaking the party when    theyve lost elections. But parties are hard to change. For    several decades, Republicans have been, relative to Democrats,    the party of social conservatism, nationalism and free-markets,    and that isnt going to change  no matter how well Rand Paul    does next year.  
    Ramesh Ponnuru, a Bloomberg View columnist, is a senior    editor for National Review, where he covers national    politics.  
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Rand Paul cant change the Republican Party