Anson Chan Fang On-sang yesterday challenged her election rival Regina Ip Lau Suk-yee to attend a rally on Sunday in support of full democracy in 2012.
But Mrs Ip refused to take up the invitation, saying there were many ways to express support for democracy.
Speaking on the campaign trail for the December 2 Hong Kong' Island Legislative Council by-election, Mrs Chan urged Mrs Ip to put her words into action by taking part in the pro-democracy rally.
'Of course, I want her to attend as she claims she also supports universal suffrage by 2012. Sunday will be a very good opportunity for everyone to express their strong demand for universal suffrage by 2012,' Mrs Chan said.
'I hope to see Mrs Ip in Victoria Park.'
Thousands of people are expected to turn up at the rally, where pan-democrats hope to set a new world record by asking participants to open umbrellas with signs of 2-0-1-2 printed on them - signifying public demand for universal suffrage.