What Does "Pro-Israel" Mean, Part 98

Goldblog reader Lon Becker makes an interesting point:

Does being pro-Israel require being a lobbyist for Israel?  When Labour is in power there are Jews who oppose their moves towards peace.  Do those Jews cease to be pro-Israel at this point?  Is there a more childish debate than whether J street is pro-Israel?  The answer to each of these questions seems to be "no".  What exactly is gained by pushing the line that people who disagree with one on certain issues are not just wrong, but anti-Israel?