Impeachment part 3

In American history, only two presidents have been impeached (but not convicted), Andrew Johnson and Bill Clinton, both Democrats harassed by Republicans for political reasons. In my opinion, only one president deserved impeachment and conviction, Richard Nixon, and he resigned before he could be impeached. Talk about impeaching Barack Obama has died down on the blogosphere because his popularity is rising in the final year of his presidency. President Obama could be re-elected to a third term if the Constitution permitted. Instead the Republicans are spending their time and money trying to defeat Hillary Clinton. What an irony for them if they succeed and their candidate faces a Sanders/Clinton ticket in the fall.