Know why are upcoming polls of Maharashtra and Haryana vital for PM Modi and Sonia Gandhi?

Election Commission of India (ECI) is expected to announce the dates for Maharashtra and Haryana Assembly elections today.
The electoral body will be holding a press conference at 12 noon today.
Earlier, the Haryana Pradesh Congress Committee had urged masses to pitch in ideas for its manifesto for the elections. The BJP came to power in the state in the last Assembly elections.