German Chancellor Angela Merkel is seeking to cement her lead in the run-up to the national elections in September with a regional election in her country's largest state.
Around 13m Germans are eligible to cast a vote in the state elections in North Rhine-Westphalia (NRW) today, which is home to almost a quarter of the country's population.
NRW has previously been a stronghold for the Social Democrats (SPD), the party lead by former European parliament president Martin Schulz.
The SPD received a boost in the polls when Schulz took over the leadership, but has since been flagging. Last month, Merkel's CDU landed a convincing defeat over the SPD in Saarland, and last week, the CDU took northern state of Schlewig-Holstein.
And, the final polls on the NRW election suggest Merkel's party is one percentage point ahead of Schulz's.
Merkel's popularity in Germany has suffered as a result of her open-door immigration policy, but the CDU has taken a lead in the NRW campaign by promising to curb migrant crime.
The poll is a crucial test of the CDU's strategy ahead of Germany's general election in September, where Merkel is seeking to extend her 11-year reign over Europe's economic powerhouse.