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."
More top news
"We are not afraid." Those were the defiant words of the Prime Minister this morning as she addressed the Commons.
Andreea Cristea, 29, remains in a critical condition after being rescued from the Thames after a terror attack along Westminster Bridge.
The Prime Minister has praised the former soldier's "huge professionalism" in trying to save the life of Pc Keith Palmer.