The regional list votes will shape the party balance in the assembly, but the constituency outcomes are the key battlefields for securing power.
BBC: Everyone has two votes - although you don't have to use both
In the constituency elections to the Assembly, Labour rose from 37.6% in 1999 to 40% in 2003.
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There then followed a debate on possible constituency boundaries for the Welsh assembly.
Ms Wood, the regional AM for South Wales Central, has already stated her intention to fight a constituency seat in the 2016 assembly election.
In 2003, Labour won Clwyd West by just 436 votes - but the Plaid, Conservative and Lib Dem candidates who had all lost in the constituency were nevertheless elected to the assembly, because in each case they were top of their party's regional list.
BBC: Everyone has two votes - although you don't have to use both
The ban was introduced by former Labour Welsh Secretary Peter Hain to stop candidates rejected by voters in constituency polls from being elected to the assembly by also standing for list seats.
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Labour Party candidate Toby Harris entered the history books as the first member elected to the GLA in Brent and Harrow, the first constituency seat of the 25-member assembly to be declared.
Party leader Leanne Wood has previously said the party must win more of the constituency seats that make up two-thirds of the Welsh assembly.
And following the decision of Martin McGuinness to resign as an MP in order to avoid so-called "double-jobbing", by holding a seat in both the House of Commons and the Northern Ireland Assembly, a by-election is also expected in his Mid Ulster constituency.
In the North East constituency, which includes Islington and Hackney, Labour's Meg Hillier gained her assembly seat with a crushing defeat of the Liberal Democrats and Conservatives.
The issue has been raised within the Assembly chamber by Richard Edwards, AM for Preseli, where the issue has been of concern to farmers in his constituency.
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