Sen. Dean Heller and Rep. Mark Amodei - both Republicans - praised Mitt Romney's decision to tap Wisconsin Rep. Paul Ryan as his running mate, describing him as knowledgeable and a man of convictions.But Senate Majority Leader Harry Reid, D-Nev., said the choice is clear evidence Romney "has doubled down on his commitment to gut Social Security and end Medicare as we know it."Rep. Shelley Berkley, D-Nev., Heller's opponent in this year's Senate race, joined Reid in criticizing the choice.But all said the selection gives voters a clear choice in November."It solidifies the base for all those folks who were …