Her party boycotted the 2010 elections, resulting in a decisive victory for the military-backed Union Solidarity and Development Party (USDP). Aung San Suu Kyi became a Pyithu Hluttaw MP while her party won 43 of the 45 vacant seats in the 2012 by-elections. In the 2015 elections, her party won a landslide victory, taking 86% of the seats in the Assembly of the Union – well more than the 67% supermajority needed to ensure that its preferred candidates were elected president and second vice president in the presidential electoral college. Although she was prohibited from becoming the president due to a clause in the constitution – her late husband and children are foreign citizens – she assumed the newly created role of State Counsellor of Myanmar, a role akin to a prime minister or a head of government.