Police said around 400 DMK workers reportedly owing allegiance to former state minister D Ramachandran gathered in front of a hall in Kothagiri where Raja, former Lok Sabha member from Udhagamandalam, was to introduce the candidate.
As the car reached the venue, chappals and eggs were hurled at the vehicle. Some of the missiles landed on the car even as the workers ghearoed Raja, by preventing him and Mubarak from getting out, they said.
DMK, which is seeking to storm back to power in the polls, has been facing protests over choice of candidates in several constituencies and had changed four of them already.
Police said they managed to clear the crowd and made way for the two leaders to reach the meeting hall.
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The meeting, attended by nearly 800 DMK workers, went off peacefully, police added.
However, the party has stuck to its decision to field Mubarak ignoring the protests.