He represents a state where a large percentage of voters are Mormon. He'd have a heck of a time winning the presidency.
Lieberman is Jewish. Shumer "the putze" is Jewish.
If you look at the polls, you'll see a huge difference in how the voters view Jews vs. Mormons. Mormons are at a far greater disadvantage.
Evangelicals like Jews, although they really don't trust Judaism. On the other hand, Mormons are out to actively recruit their children away, and Jews don't do that.