Tsipras Launches New Party Ahead of Elections
Tsipras became PM in 2015 on austerity promises but accepted harsh loans.
New party focuses on affordable housing, labor protections, and income equality.
Tsipras criticized for polarizing record and government ties to Israeli PM Netanyahu.
Greece's opposition is fragmented across seven parties.
Government spokesperson Pavlos Marinakis rejected Tsipras's comeback.
6 days ago