Can Donald Tusk save Poland's weak and divided opposition?

A scathing Twitter attack on the Polish government has fuelled speculation that European Council President, Donald Tusk, is planning a return to Polish politics to head up the country's struggling opposition. Aleks Szczerbiak writes that although he remains a dangerous opponent for the ruling party, making a successful comeback would be a long and arduous process, and pinning its hopes on Tusk could distract the opposition from the more pressing task of developing a credible and attractive political alternative.