If there was a relatively small swing to Sinn Fein, coupled with a large protest vote against a lot of the political skullduggery being unearthed at various tribunals over the past few years, it would be possible for them to get a couple of seats in Dublin. Also they might bring in some 'big name' candidates in some marginal seats - although most of the candidates have been selected nominations won't close for at least another week. Also they traditionally do well in border counties, so they could pick up one in say Louth or Donegal. And if the numbers are close they may not even need 4 - one or two could decide it one way or the other.

On the other hand there is a question about whether or not SF would be prepared to enter Govt. O Caolain has chosen to be an independent voice in the Dail, rather than join the ranks of the independents who supported the Government.