Labour's triumph in the Wythenshaw and Sale East by-election was "disastrous" for the Conservatives and Liberal Democrats, and vindicates Ed Miliband's new approach, said Ivan Lewis, shadow minister for Northern Ireland.
"This was a disastrous night for the two coalition partners," Mr Lewis told ITV's Daybreak. "The big news last night was the Lib Dems losing their deposit, the Tories being shunted into third place."
"It was a vindication of Ed Miliband's focus on the cost of living crisis which is affecting the vast majority of people in this country."
But Mr Lewis conceded that the low turnout of 28 per cent was cause for concern for all parties, saying: "all of us have to face up to the fact that people do feel alienated from mainstream politicians."