If this ends up being confirmed, one can only imagine that the blow to American illusions about international athletic dominance could stagger Congress into doing something legislative about drug use in sports generally. (In addition to spawning all manner of weepy, over-wrought stories about how "Lance never did that".)
So right now let me just go on the record as saying that, as far as I can tell, the only real issue with performance-enhancing drugs in sports is that actual sports leagues almost never have consistently enforced policies themselves. Congress really shouldn't be part of the puzzle. Whether the International Cycling Union (or MLB, etc.) should ban doping is entirely a function of what sorts of rules the ICU and its fans would like to see established. I don't know much about the ICU, but my impression of MLB, for instance, is that the league doesn't really object to doping - it probably makes the games more exciting, which, for baseball, is an accomplishment - but they don't want to come out and make doping formally allowed. And that is probably a function of Congress's righteous indignation whenever the subject comes up.
I gather that the politics of the Tour de France are somewhat different, and more nationalistic, in nature, but the basic problem of inconsistent enforcement (Landis appears to have failed his drug test three days before he won the race) seems to remain.