The former Congress president is aiming for a fifth victory from the parliamentary constituency, in a straight contest against Dinesh Pratap Singh, who recently joined the BJP after quitting her party.
Sonia Gandhi reminded reporters about the 2004 parliamentary elections, when most observers falsely predicted that the Atal Bihari Vajpayee-led NDA will return to power.
Along the road show route, enthusiastic Congress workers from all assembly segments under the Amethi Lok Sabha seat came out in strength to support her.
Sonia Gandhi, 72, clad in a red handloom saree and bearing a tilak on her forehead, came out of her SUV to wave at the crowd.
Braving the sun, Congress supporters had waited along Kutchery Road since the morning.
Local women displayed party flags. A group of students and teachers from Ram Krishna Public Inter College stood under a tree, carrying banners with pictures of Congress leaders.
Dancing and waving flags to the beat of drums, party workers raised slogans calling for a change of government, and mocking the turncoat BJP candidate.
They chanted Takht badal do taaj badal do, beimaano ka raj badal do" and "Dal badalu phasey shikanjey mein, mohar lagegi panjey par".
Shandilya Muni, who had donned a saffron scarf and claimed to be the spokesman of Shankaracharya Prayag Peeth, evoked interest among the crowd.
The Congress has alleged corruption in the Rafale aircraft deal, saying Ambani benefitted from it, a charge repeatedly denied by the Centre and the business house.
Party workers had even installed devices that showered flower petals on party leaders. Stalls distributed water packets to workers.
Polling in Rae Bareli will be held in the fifth phase on May 6.
Sonia Gandhi has earlier won the seat in 2004, 2006 bypolls, 2009 and 2014.
Since 1957, the Congress has lost this seat only three times in 1977, 1996 and 1998.
Rae Bareli constituency has five assembly segments -- Bachhrawan, Harchandpur, Rae Bareli, Sareni and Unchahar.
In 2014, the constituency recorded a poll percentage 51.73 per cent, with Sonia Gandhi getting 5,26,434 votes.
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