He was very popular when he was in the SDP, so as a person, he is often supported in the Bundestag by SDP members.
In Germany, we see the capitalists as the exploiters, so there's strong support for left-wing parties. Same in France. In Germany, however, Oskar Lafontaine unified the entire left wing into one party "Die Linke". That means "the left".
This unified stance gets them the votes of all the people that usually vote for leftist parties. Also, many people in the past didn't vote for the left because it was so fracturous. Now they do, since it isn't.
He's got a much bigger chance than say, the US socialist party. (
www.sp-usa.com). That's because Germany has a much fairer voting system than America. It's called Proportional Representation. This means minority parties get a much more realistic proportion of the seats in the Bundestag.
We have coalition Governments in Germany, partially thanks to PR. Last election, Die Linke got 13% of the vote, compared to only 11% by Die Gruenen (The Greens). Die Gruenen used to be in Government in the Grand Coalition, with the SDP. Unfortunately, FDP (Freie Demokratische Partei) always allies itself with CDU (Christliche Demokratische Union).
So Die Linke has a chance to get into Government in a coalition - probably with SDP. I support both Die Linke and Die Gruenen. Lafontaine has a chance, much greater chance than a socialist party in America or Britain would. My personal feeling is no, he won't. We can but hope he will.
(Oskar Lafontaine was one of the big reasons i became fascinated with economics some time ago).