david mercer, al jazeera el casco viejo, panama city. >> having fun in the streets instead.lease tell us what you think at aljazeera.com/americatonight. talk to us on twitter and facebook and please come back. we'll have more of "america tonight," tomorrow. else can. this is our american story. this is america tonight. >> i'm ali velshi. "on target" tonight, campaign contributions to get elected, how can they staying independent? and more mainstream than ever. tonight we're putting judicial elections on trial. that's because the honor of some american judges is being jeopardized by the potentially corrupting influence of politics and money. in some states judges have to pay for election campaigns to win seats on the bench meaning they take financial

david mercer, al jazeera el casco viejo, panama city. >> having fun in the streets instead.lease tell us what you think at aljazeera.com/americatonight. talk to us on twitter and facebook and please come back. we'll have more of "america tonight," tomorrow. >> our american story is written every day. it's not always pretty... but it's real. and we show you like no-one else can. this is our american story. this is america tonight. >> a truck bomb kills at least 50 people, injuries 200 at a busy vegetable market in baghdad. you are watching al jazeera live from doha. also coming up, two massive explosions rock china's busy port city of tianjin. the head of the u.n.'s mission

david mercer, al jazeera el casco viejo, panama city. >> having fun in the streets instead.lease tell us what you think at aljazeera.com/americatonight. talk to us on twitter and facebook and please come back. we'll have more of "america tonight," tomorrow. >> our american story is written every day. it's not always pretty... but it's real. and we show you like no-one else can. this is our american story. this is america tonight. >> one of china's biggest ports is rocked by two massive explosions, 36 firefighters are still missing. you are watching al jazeera live. political change at the point of a gun. two politicians are removed as soldiers surround the ruling party's headquarters. the head of the u.n.'s mission are fired after troops are accused of rape