Read about it here. Particularly interesting is the situation with the Lib Dems:
The leaders’ debates have produced a love-affair with the Liberal Democrats that has barely paused to question the party’s record on diversity. Although popular with Muslim voters in many constituencies, due in large part to its stance against the war in Iraq, and in spite of its mini-manifesto on equality, the Liberal Democrats are the only party whose MPs are likely to be entirely white. Of the 36 Liberal Democrat candidates from minority backgrounds, not a single one has been fielded for a winnable seat.
The Lib Dems’ poor record on minority representation has been noted by minority voters, but so has the media’s failure to reflect those concerns.