The Democrats gave Senator Daschle the top Senate post which was certainly a plus and a minus for his political career.
Exactly.
Bayh, Lincoln and Landrieu didn't have to support the most liberal members of their party. Daschle, as leader, had to.
In 2002, Thune lost even though Bush's approval was through the roof. Thune won in 2004 with Bush's <50% approval. Daschle was the difference that helped Thune.
If I were Harry Reid, I'd be very careful about how supportive I am of the left wing of the party. (IMO, he's been pretty smart so far.)