LATHROP – Rosalinda Valencia doesn’t think that Lathrop Mayor Sonny Dhaliwal has been putting his best foot forward when it comes it representing the people of the community. And she’ll get between now and November to lay out the reasons why feels that way in more detail. Valencia was the only of the three declared mayoral challengers to Dhaliwal – who announced late last month that he’d seek another term – to submit the necessary paperwork to qualify for the ballot prior to the Oct. 8 cutoff.