Former NYC mayor who spent hundreds of millions on unprecedented ad campaign quits after dismal showing in primaries, as race effectively whittled down to Biden versus Sanders

Move comes after billionaire spent unprecedented sums of money in TV ads that got him nowhere on Super Tuesday, though he is still buying new ads and scheduling campaign events

Despite early markers of success, progressive US senator has struggled to win over fan base of Bernie Sanders, leading to poor numbers; says she's not dropping out yet, though

Former US vice president hopes to turn South Carolina victory into national movement, but also faces challenge by Michael Bloomberg, who is testing his strength for the first time

After attack by Israel's UN envoy, Democratic front-runner says he'll 'do everything' to protect Jewish state, but Palestinian suffering must not be ignored

'We don't want Sanders at AIPAC. We don't want him in Israel,' declares Danny Danon of US Democratic frontrunner, who had called Netanyahu a 'reactionary racist'

Least religious candidate in the Democratic primary has recently touted his Jewish identity as linked to his commitment to combat discrimination

Prime minister gives restrained response to comments by Democratic front-runner, adds that he does not want to intervene in the US election

After Democratic front-runner says he'll weigh moving mission from Jerusalem, Israel Katz says 'people who very much support Israel will not tend to support him'

After letting independent senator get by without real scrutiny, rivals and action groups are weighing whether big-money campaigns against Sanders are too little, too late